[seminar] Seminar Ziherl, HBFD & IRB

[Hrvoje Buljan]

Poštovani kolege, ljubazno sam zamoljen da oglasim seminar Primoža Ziherla:

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*ZAJEDNIČKI SEMINAR***

*četvrtak, 13.03.2014., 14:30 sati*

Institut Ruđer Bošković, Bijenička cesta 54, predavaonica I krilo

*Primož Ziherl*

Faculty of Mathematics and Physics, University of Ljubljana

and Jožef Stefan Institute, Ljubljana**

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*Quasicrystalline order in soft-matter systems**//*

Over the past decade, quasicrystalline order has been observed in many 
soft-matter systems: in dendritic micelles, in star and tetra block 
terpolymer melts and in diblock copolymer and surfactant micelles. The 
formation of quasicrystal from such a broad range of 'soft' 
macromolecular micelles suggests that they assemble by a generic 
mechanism rather than being dependent on the specific chemistry of each 
system. Indeed, micellar softness has been postulated and shown to lead 
to quasicrystalline order. We theoretically explore this link by 
studying two-dimensional hard disks decorated with steplike 
square-shoulder repulsion that mimics, for example, the soft alkyl shell 
around the aromatic core in dendritic micelles.We find a family of 
quasicrystals with 10-, 12-, 18- and 24-fold bond orientational order 
which originate from mosaics of equilateral and isosceles triangles 
formed by particles arranged core-to-core and shoulder-to-shoulder. The 
pair interaction responsible for these phases highlights the role of 
local packing geometry in generating quasicrystallinity in soft matter, 
complementing the principles that lead to quasicrystal formation in hard 
tetrahedra. Based on simple interparticle potentials, quasicrystalline 
mosaics may well find use in diverse applications ranging from improved 
image reproduction to advanced photonics materials.

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Primož Ziherl bavi se teorijskom fizikom meke tvari i teorijskom 
biofizikom. Izvanredni je profesor na Sveušilištu u Ljubljani, a radi i 
na Institutu Jožef Stefan. Objavio je pedesetak znanstvenih radova u 
međunarodnim časopisima koji su citirani preko 800 puta. Član je 
uredništva časopisa Physical Review E. Dobitnik je mnoštva nagrada, 
uključujući i /"Outstanding Referee"/ Američkog fizikalnog društva 
(2008. godine). Upravo je objavio rad /"Mosaic two-lengthscale 
quasicrystals"/ koji će biti okosnica njegovog predavanja.

[1] T. Dotera, T. Oshiro, and P. Ziherl, Nature 506, 208--211(2014)

http://www-f1.ijs.si/~ziherl/ <http://www-f1.ijs.si/%7Eziherl/>




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